Support for multiple unity versions for asset

We are making an asset for the asset store. We developed it in 2019.2 but we want to add support for earlier versions up to 2017.2. We exported our package from the 2019 version and imported it into a 2017.2 version and made it compatible.

I am aware that we can upload from this version but then we would lose support for certain features added later to Unity (like different cell layouts on tilemaps). So we would need to upload different versions of our asset depending on the version of Unity. I know this is possible but this requires multiple projects which wouldn't work great with Git. Next to this, if we would add features to the asset later on, would we have to manually add them to every version of the asset as well?

If an asset is uploaded for an older Unity version I understand that it will theoratically also have support for later versions. But how does that work with deprecated functions etc.? Do people upload a new version everytime something goes deprecated?

 

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